Abstract: A toggle clamp unit of a plastic processing machine, especially of an injection molding machine, including a front plate and a crosshead which is arranged movable relatively to the front plate in a direction of closing, wherein at least two levers are supported articulated at the front plate, wherein the at least two levers are each connected articulated with at least one link which links are supported articulated at the crosshead and wherein the crosshead is provided with at least one linear bearing by which the crosshead is movably supported relatively to the front plate in the direction of closing. To design the linear bearing very smooth-running and to reduce the requirement of lubrication the invention proposes that the linear bearing is designed as a roller bearing.

Abstract: The invention relates to a method for the injection moulding of plastic parts from thermoplastic material. To produce stable plastic parts with a low density, the method comprises the steps: a) Production of thermoplastic melt; b) Adding of a fluid to the thermoplastic melt; c) Mixing of the thermoplastic melt containing the fluid; d) Providing of an injection moulding tool with a cavity, wherein the volume of the cavity of the injection moulding tool is expandable from an initial volume to an end volume; e) Heating of at least a part of the walls of the cavity; f) Injection of the mixture from thermoplastic melt and gas into the cavity, wherein the volume of the cavity takes the initial volume; g) Expansion of the volume of the cavity; h) Cooling of at least a part of the walls (9) of the cavity; i) Demoulding of the injection moulded plastic part after the plastic melt is at least partially solidified.

Abstract: The moulded part has at least two different sections with different outer diameter and a void inside the moulded part. To make the void, a projectile is passed through the still molten injection mouldable material in a direction of flow. A pressurized fluid is exerted in the void in the direction of flow behind the projectile to move the projectile. To obtain constant wall thicknesses, the projectile has at least one elastic or plastic section, which is delimited by a space in which the pressurized fluid can enter. The volume of the space and the effective outer diameter of the projectile can be changed by the fluid pressure and is controlled in such a manner that the space and the effective outer diameter of the projectile is enlarged and/or reduced to make the moulded part with different diameters.

Abstract: The polymer processing machine, is an injection molding machine, which has at least two electrical consumers (1, 2, 3, 4). At least one of the electrical consumers (1, 2, 3) is also designed as a generator for the conversion of kinetic energy into electrical energy. The machine is connected for its supply with electrical energy with an electrical alternating current network (5). To increase the energy efficiency of the machine, the electrical network (5) is connected to a direct current intermediate circuit (7) via a rectifier (6). At least a part of the electrical consumers (1, 2, 3, 4) are electrically connected to the direct current intermediate circuit (7) and are powered from the direct current intermediate circuit (7) with electrical energy. At least a part of the electrical consumers (1, 2, 3) which are designed as generator operation are electrically connected to the direct current intermediate circuit (7) for supplying it with generated electrical energy.

Abstract: The invention relates to an injection unit (1) of an injection molding machine which is arranged movable relatively to a machine base (2) of the injection molding machine in an axial direction (A), wherein the injection unit (1) comprises a base body (3) at which a screw cylinder (4) is arranged, wherein a screw (5) is arranged rotatable and axially movable in the screw cylinder (4), wherein the screw (5) is connected with a drive element (6) at one of its axial ends which can rotate the screw and can also move it in axial direction (A) and wherein the drive element (6) comprises a gear element (7) which is movable in axial direction (A) as well as an actuator (8) which is in engagement with the gear element (7) and with the base body (3) and which can perform a translational movement in axial direction (A).

Abstract: The invention relates to a device for the injection moulding of a moulded part (2) comprising a void (1), wherein a projectile (10) can be positioned at a fluid injection nozzle (8) in the region of a fluid aperture (9), which projectile (10) can be caused to flow in the direction of the longitudinal axis (L). To allow the production of moulded parts with enclosed voids in a better way the invention is characterized in that the fluid injection nozzle (8) comprises a section (11) entering into a cavity (5) of a mould, which section (11) is free from any undercut in a direction (E) of insertion of the fluid injection nozzle (8) into the cavity (5), wherein an angle (?) is arranged between a longitudinal axis (L) and the direction (E) of insertion.

Abstract: The invention relates to a method for injection moulding of a moulded part (1), which has at least two different sections (2, 3) being different in the outer diameter (D1, D2), wherein a void (4) is produced in the inner of the moulded part (1) by causing a projectile (5) in the direction of a longitudinal axis (L) of the moulded part (1) through the still molten injection mouldable material in a direction of flow (F), whereto a pressurized fluid is exerted in the void (4) in the direction of flow (F) behind the projectile (5) which moves the projectile (5) into the direction of flow (F).

Abstract: The invention relates to a plasticizing and injection unit (1) of an injection moulding machine To inject especially smallest amounts of plastic melt in an injection moulding tool for injection moulding of small and smallest parts in a process optimized way the unit comprises a screw cylinder (2) in which a plasticizing screw is arranged rotatable and axially movable and an injection element (4) comprising a piston-cylinder system (5, 6), wherein a metered amount of plastic melt, which is deposited in a section (7) of a cylinder (6), is expelled via an injection nozzle (8) into an injection moulding tool by an axial movement of a piston (5) in the cylinder (6), wherein a flow path (9) is arranged between the end of the screw cylinder (2) and the section (7) of the cylinder (6) and wherein the flow path (9) is free from valve elements. Furthermore, the invention relates to a method for injection moulding of a part.

Abstract: The polymer processing machine, is an injection moulding machine, which has at least two electrical consumers (1, 2, 3, 4). At least one of the electrical consumers (1, 2, 3) is also designed as a generator for the conversion of kinetic energy into electrical energy. The machine is connected for its supply with electrical energy with an electrical alternating current network (5). To increase the energy efficiency of the machine, the electrical network (5) is connected to a direct current intermediate circuit (7) via a rectifier (6). At least a part of the electrical consumers (1, 2, 3, 4) are electrically connected to the direct current intermediate circuit (7) and are powered from the direct current intermediate circuit (7) with electrical energy. At least a part of the electrical consumers (1, 2, 3) which are designed as generator operation are electrically connected to the direct current intermediate circuit (7) for supplying it with generated electrical energy.

Abstract: The invention relates to an injection unit (1) of an injection molding machine which is arranged movable relatively to a machine base (2) of the injection molding machine in an axial direction (A), wherein the injection unit (1) comprises a base body (3) at which a screw cylinder (4) is arranged, wherein a screw (5) is arranged rotatable and axially movable in the screw cylinder (4), wherein the screw (5) is connected with a drive element (6) at one of its axial ends which can rotate the screw and can also move it in axial direction (A) and wherein the drive element (6) comprises a gear element (7) which is movable in axial direction (A) as well as an actuator (8) which is in engagement with the gear element (7) and with the base body (3) and which can perform a translational movement in axial direction (A).

Abstract: A system and process for producing pressing force of an injection unit of an injection molding machine on a mold, which comprises the steps: a) actuating a linear drive unit to bring an injection device to rest on a mold; a working cylinder unit being supplied with fluid via a store during the axial displacement of the injection device until the required rest position on the mold is reached. Provision is made according to one aspect of the invention in that after reaching the rest position on the mold, a blocking element is closed and the connection within a connection unit is opened, and b) the linear drive unit is further actuated, c) a displacement piston is displaced relative to the hydraulic element, and d) increased pressure is produced in the working cylinder unit via a fluid connection in the hydraulic element to increase the contact pressure of the injection unit on the mold.

Abstract: The invention relates to an interlock for a column, comprising a piston with a piston rod, such that the piston rod is disposed in a claw bush, the claw bush being disposed in a single- or multi-part plate, such that the piston and the claw bush can move in the single- or multi-part plate. In one embodiment, the claw bush has at least two stages, to apply the force in a distributed manner, the contour of the stages corresponding to the end of the piston rod and/or to the end of the column, the average radius of the first stage differing from the average radius of the second stage.

Abstract: The invention relates to a method and an apparatus for injection molding thermoplastic molded parts, having at least one cavity. The method comprises the following steps: a) injecting thermoplastic melt from an injection unit along a melt flow path into the cavity of an injection molding tool; b) injecting a fluid into the still liquid plastic material, so that the plastic material is pressed against the walls of the cavity; c) allowing the plastic material to cool until it forms the self-supporting molded part; and d) removing the molded part from the cavity of the injection molding tool.

Abstract: A process for injection molding of molded parts made from thermoplastic plastic material having at least one cavity, which includes: a) injection of thermoplastic plastic melt from an injection unit along a melt flow path into the cavity of an injection-molding die; b) injection of a fluid into the still molten plastic material, so that the latter is pressed against the walls of the cavity; c) allowing the plastic material to cool until the latter forms the molded part in self-supporting manner; and d) releasing the molded part from the cavity of the injection-molding die.

Abstract: Process and apparatus for injection molding of molded parts made from plastic material having at least one cavity, which includes: a) injection of plastic melt from an injection unit along a melt flow path into the cavity of an injection-molding die; b) injection of a fluid into the still molten plastic material, so that the latter is pressed against the walls of the cavity; c) allowing the plastic material to solidify until the latter forms the molded part in self-supporting manner; and d) releasing the molded part from the cavity of the injection-molding die.

Abstract: Injection unit for an injection molding machine to process material, comprising a plasticizing cylinder, a screw, and a screw drive including two electric motors, such that the two motors have an electrically controlled connection to one another, to implement an injection and metering process, such that the two motors can be operated in the same or opposite direction of rotation and with the same or different rotational speed. A space is formed by at least two sleeves which can move relative to one another, and by respectively adjoining plate members, so as to take up lubricating oil, such that the sleeves can slide into one another, and the junctions of the parts which form the space are constructed tight against the environment, at least for lubricants.

Abstract: A method for the multi-component injection molding of plastic parts, in which at least two different plastic components are injected into an injection molding tool to form a plastic part, the method comprising the following steps: a) introducing a first plastic component into a melt accumulation chamber, which is bounded by a piston-like end section; b) subsequently introducing a second plastic component into the melt accumulation chamber; c) transferring plastic melt accumulated in the melt accumulation chamber into the injection molding tool. In one embodiment the pressure conditions in the cavity region are homogenized. For this purpose the invention specifies that, when the plastic melt is transferred in accordance with the above step c), the piston-like end section of the melt accumulation chamber is moved in such a way that it forms part of the cavity wall of the injection molding tool.

Abstract: A system and process for producing pressing force of an injection unit of an injection molding machine on a mold, which comprises the steps: a) actuating a linear drive unit to bring an injection device to rest on a mold; a working cylinder unit being supplied with fluid via a store during the axial displacement of the injection device until the required rest position on the mold is reached. Provision is made according to one aspect of the invention in that after reaching the rest position on the mold, a blocking element is closed and the connection within a connection unit is opened, and b) the linear drive unit is further actuated, c) a displacement piston is displaced relative to the hydraulic element, and d) increased pressure is produced in the working cylinder unit via a fluid connection in the hydraulic element to increase the contact pressure of the injection unit on the mold.

Abstract: Device and process for injection molding of molded parts made from plastic material having at least one cavity, which has means for injecting plastic melt into the cavity of an injection-molding die along a melt flow path and means for injecting a fluid into the still molten plastic material, wherein the means for injecting a fluid are designed in order to inject a liquid at preset pressure and preset quantity. Provision is made in that the means for injecting a liquid includes a first part element, which is arranged centrally and remote from the injection-molding die and supplies at least one injection-molding die, and includes at least one second part element, which is arranged in the immediate vicinity of the injection-molding die, and a third part element, which is arranged locally on the injection-molding die at least during injection of the liquid.

Abstract: Process and apparatus for injection molding of molded parts made from plastic material having at least one cavity, which includes: a) injection of plastic melt from an injection unit along a melt flow path into the cavity of an injection-molding die; b) injection of a fluid into the still molten plastic material, so that the latter is pressed against the walls of the cavity; c) allowing the plastic material to solidify until the latter forms the molded part in self-supporting manner; and d) releasing the molded part from the cavity of the injection-molding die.